There are rational laws (or could be) that could stop the gun madness without encroaching on the right wing’s view of the second amendment or the real desire of some to use guns to hunt.
The simple answer begins with a strict national gun registration law. All guns, like all cars, ought to have serial numbers. Once we have that, the rest is obvious:
1. Possession of an unregistered gun should be a major felony,
2. If a registered weapon is used in 
a crime, the owner should be liable for civil damages.
3. Owner responsibility also applies to vendors and manufacturers. Under civil law, the defendant has to prove his or her innocence.
In effect this would mean a gun seller who distributes guns to gangs in Chicago would face onerous legal bills to prove he or she had fulfilled due diligence to assure that the guns were not sold to some one who would endanger others. ..Similar laws regulate bars!
4. The same liability would apply to anyone who manufactures a gun that can be used in a way not related to hunting or defnce. E.g the pistol show above. If someone is killed hy that damned thing, the maker ought to pay!